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第15章 设备相关位图_15.3 DIB和DDB的结合

时间：2021-07-01 10:21:17 帮助过：1人阅读

15.3.1 从DIB创建DDB

（1）hBitmap =CreateDIBitmap(…)——注意这名称会误导，实际上创建的是DDB

参数

说明

hdc

设备环境句柄，可以为NULL。

pInfoHdr

指向DIB信息头的指针，即BITMAPINFOHEADER

fInit

0或CBM_INIT。CBM_INIT指定用后面3个参数来初始化DDB中的像素位

pBits

DIB像素位的指针

pInfo

DIB信息指针，即BITMAPINFO（包含BITMAPINFOHEADER和颜色表）

fClrUse

颜色使用标志位：DIB_RGB_COLORS（0）或DIB_PAL_COLORS（1）

注意：①返回值：跟CreateBitmap一样都返回一个GDI位图对象，可以直接选入DC中，并在上面绘图，以改变像素位。

　　   ②名称会误导，它是从一个DIB中创建一个DDB。

（2）CreateDIBitmap函数内部大致的代码实现

  1. HBITMAP CreateDIBitmap(HDC hdc, CONST BITMAPINFOHEADER*<span style="color: #000000;"> pbmih,
  2.      DWORD fInit, CONST VOID</span>* pBits,CONST BITMAPINFO*<span style="color: #000000;"> pbmi, UINT fUsage)
  3. {
  4.      HBITMAP hBitmap;
  5.      HDC     hdc,hdcMem;
  6.      </span><span style="color: #0000ff;">int</span><span style="color: #000000;">     cx, cy, iBitCount;
  7.      </span><span style="color: #008000;">//</span><span style="color: #008000;">从第2个参数读取DIB信息头的信息</span>
  8.      <span style="color: #0000ff;">if</span> (pbmih->biSize == <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(BITMAPCOREHEADER))
  9.      {
  10.          cx </span>= ((PBITMAPCOREHEADER)pbmih)-><span style="color: #000000;">bcWidth;
  11.          cy </span>= ((PBITMAPCOREHEADER)pbmih)-><span style="color: #000000;">bcHeight;
  12.          iBitCount </span>= ((PBITMAPCOREHEADER)pbmih)-><span style="color: #000000;">bcBitCount;
  13.      }
  14.      </span><span style="color: #0000ff;">else</span><span style="color: #000000;">
  15.      {
  16.          cx </span>= pbmih-><span style="color: #000000;">biWidth;
  17.          cy </span>= pbmih-><span style="color: #000000;">biHeight;
  18.          iBitCount </span>= pbmih-><span style="color: #000000;">biBitCount;
  19.      }
  20.  
  21.      </span><span style="color: #008000;">//</span><span style="color: #008000;">创建DDB</span>
  22.      <span style="color: #0000ff;">if</span><span style="color: #000000;"> (hdc)
  23.          hBitmap </span>=<span style="color: #000000;"> CreateCompatibleBitmap(hdc, cx, cy);
  24.      </span><span style="color: #0000ff;">else</span><span style="color: #000000;">
  25.          hBitmap </span>= CreateBitmap(cx, cy, <span style="color: #800080;">1</span>, <span style="color: #800080;">1</span>, NULL);<span style="color: #008000;">//</span><span style="color: #008000;">单色位图
  26.      </span><span style="color: #008000;">//</span><span style="color: #008000;">后面4个参数是用来初始化DDB的</span>
  27.      <span style="color: #0000ff;">if</span> (fInit ==<span style="color: #000000;"> CBM_INIT)
  28.      {
  29.          hdcMem </span>=<span style="color: #000000;"> CreateCompatibleDC(hdc);
  30.          SelectObject(hdcMem, hBitmap);
  31.          </span><span style="color: #008000;">//</span><span style="color: #008000;">在内存位图表面绘图，注意这里是DDB位图，己被选入内存DC</span><span style="color: #000000;">
  32.          SetDIBitsToDevice(hdcMem, </span><span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, cx, cy, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span><span style="color: #000000;">, cy, pBits, pbmi, fUsage);
  33.          DeleteDC(hdcMem);
  34.      }
  35.      </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> hBitmap;
  36. }</span>

 

（3）应用举例

　　①创建单色GDI位图：hBitmap =CreateDIBitmap(NULL,pbmih,0,NULL,NULL,0);

　　②DC兼容位图：hBitmap = CreateDIBitmap(hdc,pbmih,0,NULL,NULL,0);//未初始化

（4）当CreateDIBitmap时未初始化像素位，后期可调用SetDIBits初始化DDB像素位

参数

说明

hdc

设备环境句柄，当DIB_PAL_COLORS时才需要设备hdc

hBitmap

要设置像素位的位图句柄

yScan

要转换的第一行扫描线

cyScans

扫描线的行数

pBits

将该像素位设给hBitmap的像素位。

pInfo

指向DIB信息头的指针

fClrUse

颜色使用标志

【DIBCONV程序】

技术分享

  1. <span style="color: #008000;">/*</span><span style="color: #008000;">------------------------------------------------------------
  2. DIBCONV.C --Converts a DIB to a DDB
  3. (c) Charles Petzold, 1998
  4. ------------------------------------------------------------</span><span style="color: #008000;">*/</span><span style="color: #000000;">
  5. #include </span><windows.h><span style="color: #000000;">
  6. #include </span><span style="color: #800000;">"</span><span style="color: #800000;">resource.h</span><span style="color: #800000;">"</span><span style="color: #000000;">
  7. LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
  8. </span><span style="color: #0000ff;">static</span> TCHAR szAppName[] = TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">DibConv</span><span style="color: #800000;">"</span><span style="color: #000000;">);
  9. </span><span style="color: #0000ff;">int</span><span style="color: #000000;"> WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
  10.                    PSTR szCmdLine, </span><span style="color: #0000ff;">int</span><span style="color: #000000;"> iCmdShow)
  11. {
  12.     HWND         hwnd;
  13.     MSG          msg;
  14.     WNDCLASSEX     wndclass;
  15.     HACCEL       hAccel;
  16.     wndclass.style </span>= CS_HREDRAW |<span style="color: #000000;"> CS_VREDRAW;
  17.     wndclass.cbSize </span>= <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(WNDCLASSEX);
  18.     wndclass.lpfnWndProc </span>=<span style="color: #000000;"> WndProc;
  19.     wndclass.cbClsExtra </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  20.     wndclass.cbWndExtra </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  21.     wndclass.hInstance </span>=<span style="color: #000000;"> hInstance;
  22.     wndclass.hIcon </span>=<span style="color: #000000;"> LoadIcon(hInstance, szAppName);
  23.     wndclass.hIconSm </span>=<span style="color: #000000;"> LoadIcon(hInstance, szAppName);
  24.     wndclass.hCursor </span>=<span style="color: #000000;"> LoadCursor(NULL, IDC_ARROW);
  25.     wndclass.hbrBackground </span>=<span style="color: #000000;"> (HBRUSH)GetStockObject(WHITE_BRUSH);
  26.     wndclass.lpszMenuName </span>=<span style="color: #000000;"> szAppName;
  27.     wndclass.lpszClassName </span>=<span style="color: #000000;"> szAppName;
  28.     </span><span style="color: #0000ff;">if</span> (!RegisterClassEx(&<span style="color: #000000;">wndclass))
  29.     {
  30.         MessageBox(NULL, TEXT(</span><span style="color: #800000;">"</span><span style="color: #800000;">This program requires Windows NT!</span><span style="color: #800000;">"</span><span style="color: #000000;">),
  31.                    szAppName, MB_ICONERROR);
  32.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  33.     }
  34.     hwnd </span>= CreateWindow(szAppName,                  <span style="color: #008000;">//</span><span style="color: #008000;"> window class name</span>
  35.                         TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">DIB to DDB Conversion</span><span style="color: #800000;">"</span>), <span style="color: #008000;">//</span><span style="color: #008000;"> window caption</span>
  36.                         WS_OVERLAPPEDWINDOW,        <span style="color: #008000;">//</span><span style="color: #008000;"> window style</span>
  37.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial x position</span>
  38.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial y position</span>
  39.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial x size</span>
  40.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial y size</span>
  41.                         NULL,                       <span style="color: #008000;">//</span><span style="color: #008000;"> parent window handle</span>
  42.                         NULL,                       <span style="color: #008000;">//</span><span style="color: #008000;"> window menu handle</span>
  43.                         hInstance,                  <span style="color: #008000;">//</span><span style="color: #008000;"> program instance handle</span>
  44.                         NULL);                     <span style="color: #008000;">//</span><span style="color: #008000;"> creation parameters</span>
  45. <span style="color: #000000;">
  46.     ShowWindow(hwnd, iCmdShow);
  47.     UpdateWindow(hwnd);
  48.     hAccel </span>=<span style="color: #000000;"> LoadAccelerators(hInstance, szAppName);
  49.     </span><span style="color: #0000ff;">while</span> (GetMessage(&msg, NULL, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span><span style="color: #000000;">))
  50.     {
  51.         </span><span style="color: #0000ff;">if</span> (!TranslateAccelerator(hwnd, hAccel, &<span style="color: #000000;">msg))
  52.         {
  53.             TranslateMessage(</span>&<span style="color: #000000;">msg);
  54.             DispatchMessage(</span>&<span style="color: #000000;">msg);
  55.         }
  56.     }
  57.     </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> msg.wParam;
  58. }
  59. HBITMAP   CreateBitmapObjectFromDibFile(HDC hdc, PTSTR szFileName)
  60. {
  61.     HBITMAP hBitmap;
  62.     BITMAPFILEHEADER</span>*<span style="color: #000000;"> pbmfh;
  63.     BOOL    bSuccess;
  64.     HANDLE  hFile;
  65.     DWORD   dwFileSize, dwHighSize, dwBytesRead;
  66.     </span><span style="color: #008000;">//</span><span style="color: #008000;">打开位图，可读可写</span>
  67.     hFile =<span style="color: #000000;"> CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
  68.                        OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
  69.     </span><span style="color: #0000ff;">if</span> (hFile ==<span style="color: #000000;"> INVALID_HANDLE_VALUE)
  70.         </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> NULL;
  71.     </span><span style="color: #008000;">//</span><span style="color: #008000;">读入整个文件</span>
  72.     dwFileSize = GetFileSize(hFile, &<span style="color: #000000;">dwHighSize);
  73.     </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> (dwHighSize)
  74.     {
  75.         CloseHandle(hFile);
  76.         </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> NULL;
  77.     }
  78.     pbmfh </span>= <span style="color: #0000ff;">malloc</span><span style="color: #000000;">(dwFileSize);
  79.     </span><span style="color: #0000ff;">if</span> (!<span style="color: #000000;">pbmfh)
  80.     {
  81.         CloseHandle(hFile);
  82.         </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> NULL;
  83.     }
  84.     bSuccess </span>= ReadFile(hFile, pbmfh, dwFileSize, &<span style="color: #000000;">dwBytesRead, NULL);
  85.     CloseHandle(hFile);
  86.     </span><span style="color: #008000;">//</span><span style="color: #008000;">检验是否是位图</span>
  87.     <span style="color: #0000ff;">if</span> (!bSuccess || (dwBytesRead != dwFileSize) || (pbmfh->bfType != *(WORD*)<span style="color: #800000;">"</span><span style="color: #800000;">BM</span><span style="color: #800000;">"</span><span style="color: #000000;">))
  88.     {
  89.         </span><span style="color: #0000ff;">free</span><span style="color: #000000;">(pbmfh);
  90.         </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> NULL;
  91.     }
  92.     </span><span style="color: #008000;">//</span><span style="color: #008000;">创建DDB——注意，这里读入整个文件，并从该DIB文件读入信息头、像素位等信息</span>
  93.     hBitmap = CreateDIBitmap(hdc, (BITMAPINFOHEADER*)(pbmfh + <span style="color: #800080;">1</span><span style="color: #000000;">),
  94.                              CBM_INIT,
  95.                              (BYTE</span>*)pbmfh + pbmfh-><span style="color: #000000;">bfOffBits,
  96.                              (BITMAPINFO</span>*)(pbmfh + <span style="color: #800080;">1</span><span style="color: #000000;">),
  97.                              DIB_RGB_COLORS);
  98.     </span><span style="color: #0000ff;">free</span><span style="color: #000000;">(pbmfh);
  99.     </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> hBitmap;
  100. }
  101. LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
  102. {
  103.     </span><span style="color: #0000ff;">static</span> TCHAR szFilter[] = TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">Bitmap File(*.bmp)\0*.bmp\0</span><span style="color: #800000;">"</span><span style="color: #000000;">)
  104.         TEXT(</span><span style="color: #800000;">"</span><span style="color: #800000;">All Files(*.*)\0*.*\0\0</span><span style="color: #800000;">"</span><span style="color: #000000;">);
  105.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> TCHAR szFileName[MAX_PATH], szTitleName[MAX_PATH];
  106.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> cxClient, cyClient;
  107.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> HBITMAP hBitmap;
  108.     HDC         hdc, hdcMem;
  109.     PAINTSTRUCT ps;
  110.     BITMAP  bitmap;
  111.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> OPENFILENAME  ofn;
  112.     </span><span style="color: #0000ff;">switch</span><span style="color: #000000;"> (message)
  113.     {
  114.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_CREATE:
  115.         memset(</span>&ofn, <span style="color: #800080;">0</span>, <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(OPENFILENAME));
  116.         ofn.lStructSize </span>= <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(OPENFILENAME);
  117.         ofn.hwndOwner </span>=<span style="color: #000000;"> hwnd;
  118.         ofn.lpstrFilter </span>=<span style="color: #000000;"> szFilter;
  119.         ofn.lpstrFile </span>=<span style="color: #000000;"> szFileName;
  120.         ofn.nMaxFile </span>=<span style="color: #000000;"> MAX_PATH;
  121.         ofn.lpstrTitle </span>=<span style="color: #000000;"> szTitleName;
  122.         ofn.nMaxFileTitle </span>=<span style="color: #000000;"> MAX_PATH;
  123.         ofn.lpstrDefExt </span>= TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">*.bmp</span><span style="color: #800000;">"</span><span style="color: #000000;">);
  124.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  125.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_SIZE:
  126.         cxClient </span>=<span style="color: #000000;"> LOWORD(lParam);
  127.         cyClient </span>=<span style="color: #000000;"> HIWORD(lParam);
  128.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  129.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_COMMAND:
  130.         </span><span style="color: #0000ff;">switch</span><span style="color: #000000;"> (LOWORD(wParam))
  131.         {
  132.         </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> IDM_FILE_OPEN:
  133.             </span><span style="color: #008000;">//</span><span style="color: #008000;">显示打开对话框</span>
  134.             <span style="color: #0000ff;">if</span> (!GetOpenFileName(&<span style="color: #000000;">ofn))
  135.                 </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  136.             </span><span style="color: #008000;">//</span><span style="color: #008000;">删除己经打开的位图</span>
  137.             <span style="color: #0000ff;">if</span><span style="color: #000000;"> (hBitmap)
  138.             {
  139.                 DeleteObject(hBitmap);
  140.                 hBitmap </span>=<span style="color: #000000;"> NULL;
  141.             }
  142.             SetCursor(LoadCursor(NULL, IDC_WAIT));
  143.             ShowCursor(TRUE);
  144.             </span><span style="color: #008000;">//</span><span style="color: #008000;">从DIB位图文件中创建DDB</span>
  145.             hdc =<span style="color: #000000;"> GetDC(hwnd);
  146.             hBitmap </span>=<span style="color: #000000;"> CreateBitmapObjectFromDibFile(hdc, szFileName);
  147.             ReleaseDC(hwnd, hdc);
  148.             ShowCursor(FALSE);
  149.             SetCursor(LoadCursor(NULL, IDC_ARROW));
  150.             </span><span style="color: #008000;">//</span><span style="color: #008000;">更新客户区内容</span>
  151. <span style="color: #000000;">            InvalidateRect(hwnd, NULL, TRUE);
  152.             </span><span style="color: #008000;">//</span><span style="color: #008000;">错误提示</span>
  153.             <span style="color: #0000ff;">if</span> (hBitmap ==<span style="color: #000000;"> NULL)
  154.             {
  155.                 MessageBox(hwnd, TEXT(</span><span style="color: #800000;">"</span><span style="color: #800000;">Cannot load DIB file</span><span style="color: #800000;">"</span>), szAppName, MB_OK |<span style="color: #000000;"> MB_ICONEXCLAMATION);
  156.             }
  157.             </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  158.         }
  159.         </span><span style="color: #0000ff;">break</span><span style="color: #000000;">;
  160.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_PAINT:
  161.         hdc </span>= BeginPaint(hwnd, &<span style="color: #000000;">ps);
  162.         </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> (hBitmap)
  163.         {
  164.             GetObject(hBitmap, </span><span style="color: #0000ff;">sizeof</span>(BITMAP), &<span style="color: #000000;">bitmap);
  165.             hdcMem </span>=<span style="color: #000000;"> CreateCompatibleDC(hdc);
  166.             SelectObject(hdcMem, hBitmap);
  167.             BitBlt(hdc, </span><span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, bitmap.bmWidth, bitmap.bmHeight, hdcMem, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span><span style="color: #000000;">, SRCCOPY);
  168.             DeleteDC(hdcMem);
  169.         }
  170.         EndPaint(hwnd, </span>&<span style="color: #000000;">ps);
  171.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  172.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_DESTROY:
  173.         </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> (hBitmap)
  174.             DeleteObject(hBitmap);
  175.         PostQuitMessage(</span><span style="color: #800080;">0</span><span style="color: #000000;">);
  176.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  177.     }
  178.     </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> DefWindowProc(hwnd, message, wParam, lParam);
  179. }</span>

//resource.h

  1. <span style="color: #008000;">//</span><span style="color: #008000;">{{NO_DEPENDENCIES}}
  2. </span><span style="color: #008000;">//</span><span style="color: #008000;"> Microsoft Visual C++ 生成的包含文件。
  3. </span><span style="color: #008000;">//</span><span style="color: #008000;"> 供 DIBConv.rc 使用
  4. </span><span style="color: #008000;">//
  5. </span><span style="color: #0000ff;">#define</span> IDM_FILE_OPEN                   40001
  6. <span style="color: #008000;">//</span><span style="color: #008000;"> Next default values for new objects
  7. </span><span style="color: #008000;">//</span> 
  8. <span style="color: #000000;">#ifdef APSTUDIO_INVOKED
  9. #ifndef APSTUDIO_READONLY_SYMBOLS
  10. </span><span style="color: #0000ff;">#define</span> _APS_NEXT_RESOURCE_VALUE        103
  11. <span style="color: #0000ff;">#define</span> _APS_NEXT_COMMAND_VALUE         40004
  12. <span style="color: #0000ff;">#define</span> _APS_NEXT_CONTROL_VALUE         1001
  13. <span style="color: #0000ff;">#define</span> _APS_NEXT_SYMED_VALUE           101
  14. <span style="color: #0000ff;">#endif</span>
  15. <span style="color: #0000ff;">#endif</span>

//DibConv.rc

  1. <span style="color: #008000;">//</span><span style="color: #008000;"> Microsoft Visual C++ generated resource script.
  2. </span><span style="color: #008000;">//
  3. </span>#include <span style="color: #800000;">"</span><span style="color: #800000;">resource.h</span><span style="color: #800000;">"</span>
  4. <span style="color: #0000ff;">#define</span> APSTUDIO_READONLY_SYMBOLS
  5. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  6. <span style="color: #008000;">//</span>
  7. <span style="color: #008000;">//</span><span style="color: #008000;"> Generated from the TEXTINCLUDE 2 resource.
  8. </span><span style="color: #008000;">//
  9. </span>#include <span style="color: #800000;">"</span><span style="color: #800000;">winres.h</span><span style="color: #800000;">"</span>
  10. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  11. <span style="color: #0000ff;">#undef</span> APSTUDIO_READONLY_SYMBOLS
  12. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  13. <span style="color: #008000;">//</span><span style="color: #008000;"> 中文(简体，中国) resources</span>
  14. <span style="color: #0000ff;">#if</span> !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)<span style="color: #000000;">
  15. LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED
  16. #ifdef APSTUDIO_INVOKED
  17. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  18. <span style="color: #008000;">//</span>
  19. <span style="color: #008000;">//</span><span style="color: #008000;"> TEXTINCLUDE
  20. </span><span style="color: #008000;">//
  21. </span><span style="color: #800080;">1</span><span style="color: #000000;"> TEXTINCLUDE
  22. BEGIN
  23. </span><span style="color: #800000;">"</span><span style="color: #800000;">resource.h\0</span><span style="color: #800000;">"</span><span style="color: #000000;">
  24. END
  25. </span><span style="color: #800080;">2</span><span style="color: #000000;"> TEXTINCLUDE
  26. BEGIN
  27. </span><span style="color: #800000;">"</span><span style="color: #800000;">#include </span><span style="color: #800000;">""</span><span style="color: #800000;">winres.h</span><span style="color: #800000;">""</span><span style="color: #800000;">\r\n</span><span style="color: #800000;">"</span>
  28. <span style="color: #800000;">"</span><span style="color: #800000;">\0</span><span style="color: #800000;">"</span><span style="color: #000000;">
  29. END
  30. </span><span style="color: #800080;">3</span><span style="color: #000000;"> TEXTINCLUDE
  31. BEGIN
  32. </span><span style="color: #800000;">"</span><span style="color: #800000;">\r\n</span><span style="color: #800000;">"</span>
  33. <span style="color: #800000;">"</span><span style="color: #800000;">\0</span><span style="color: #800000;">"</span><span style="color: #000000;">
  34. END
  35. </span><span style="color: #0000ff;">#endif</span>    <span style="color: #008000;">//</span><span style="color: #008000;"> APSTUDIO_INVOKED</span>
  36. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  37. <span style="color: #008000;">//</span>
  38. <span style="color: #008000;">//</span><span style="color: #008000;"> Menu
  39. </span><span style="color: #008000;">//
  40. </span><span style="color: #000000;">DIBCONV MENU
  41. BEGIN
  42. POPUP </span><span style="color: #800000;">"</span><span style="color: #800000;">&File</span><span style="color: #800000;">"</span><span style="color: #000000;">
  43. BEGIN
  44. MENUITEM </span><span style="color: #800000;">"</span><span style="color: #800000;">&Open...\tCtrl+O</span><span style="color: #800000;">"</span><span style="color: #000000;">, IDM_FILE_OPEN
  45. END
  46. END
  47. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  48. <span style="color: #008000;">//</span>
  49. <span style="color: #008000;">//</span><span style="color: #008000;"> Accelerator
  50. </span><span style="color: #008000;">//
  51. </span><span style="color: #000000;">DIBCONV ACCELERATORS
  52. BEGIN
  53. </span><span style="color: #800000;">"</span><span style="color: #800000;">^O</span><span style="color: #800000;">"</span><span style="color: #000000;">, IDM_FILE_OPEN, ASCII, NOINVERT
  54. END
  55. </span><span style="color: #0000ff;">#endif</span>    <span style="color: #008000;">//</span><span style="color: #008000;"> 中文(简体，中国) resources</span>
  56. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  57. <span style="color: #000000;">#ifndef APSTUDIO_INVOKED
  58. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  59. <span style="color: #008000;">//</span>
  60. <span style="color: #008000;">//</span><span style="color: #008000;"> Generated from the TEXTINCLUDE 3 resource.
  61. </span><span style="color: #008000;">//
  62. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  63. <span style="color: #0000ff;">#endif</span>    <span style="color: #008000;">//</span><span style="color: #008000;"> not APSTUDIO_INVOKED</span>

15.3.2 从DDB到DIB

（1）GetDIBits函数——将DDB转成DIB（即从hBitmap中获得pInfo,pBits等信息）

参数

说明

hdc

设备环境句柄

hBitmap

要获取像素位的位图句柄

yScan

要转换的第一行扫描线

cyScans

扫描线的行数

pBits

将hBitmap的像素位读入该内存中。

pInfo

指向DIB信息头的指针

fClrUse

颜色使用标志

注意：

①这个函数并不是SetDIBits的简单逆运算而己。因为DIB转为设备相关的格式时，会有信息的丢失。

②实际上很少用到这个函数，因为如果有能拿hBitmap句柄，却没有位图数据信息的情况很少（如剪贴板），但剪贴板提供了自动转换为DIB的功能。

15.3.3 DIB 区块（DIB Section）

（1）DDB和DIB的区别

区别

DDB(Windows内部结构)

DIB（数据结构是己公布的）

颜色组织

必须是黑白或与实际输出设备一样的格式（不含颜色表，，像素值表示索引或黑白，因数据结构未公布，不能直接访问像素位）

采用几种颜色格式之一（可以有自己的颜色表，像素位可直接访问）

每行像素数

2的倍数

4的倍数

对象构成

一个GDI位图对象，要通过选入内存dc来更改像素位或绘图.用一个hBitmap位图句柄来表示。

使用方法：

//加载或创建DDB，而资源位图本身是DIB

hBitmap =LoadBitmap(…)

//创建兼容DC,因为是设备相关的。

hdcMem = CreateCompatibleDC(hdc);

//选入dc

SelectObject(hdc,hBitmap);

//画图，改变hBitmap像素位

Rectange(hdcMem…)

//显示到设备环境中

BitBlt(hdc,…,hdcMem…,SRCCOPY);

//删除等

DeleteDC(hdcMem);

 

是个文件或内存区域，内存结构与文件结构类似，可直接通过pBits更改像素位。

使用方法：

//读入位图文件

hFile = CreateFile(…);

//从文件中DIB位图读入整个或部分DIB的信息

//分配文件头内存，读入信息

pbmhf =malloc(…);//文件头

pbmi = malloc(…);//信息头

pBits = malloc(…); //像素位数据

//读入各部分的信息

ReadFile(hFile,&pbmhf,….)

…

//显示

SetDIBtoDevice(hdc,…);//输出，可以不需要内存兼容DC（因为设备无关）

存在形式

只能存在于内存中

可存在于内存或文件中

转换

可相互转换，但涉及设备无关的像素位与设备相关像素位的转换

 

（2）CreateDIBSection函数——返回的对象是个“杂种”：即是GDI位图对象（DDB），又更像DIB（有pBits和pInfo），意味着可以选入设备环境修改像素位，也可以直接修改像素位。

参数

说明

hdc

设备环境句柄，只有在fClrUse设为DIB_PAL_COLORS时才可以要设置hdc。当fClrUse设为DIB_RGB_COLORS时，hdc将被忽略。

pInfo

指向DIB信息的指针

fClrUse

颜色使用标志——DIB_RGB_COLORS或DIB_PAL_COLORS。

ppBits

指向像素位指针的指针。

1、该函数调用时，会把pBits设置成指向某个内存块的指针（该内存由系统管理，DeleteObject(hBitmap)时自动释放，调用函数时，实际上并未为该空间预留大小，只有在赋值时，才会占用空间，我们的程序也不需要自己为pBits分配空间），在调用该函数完后，程序可以从DIB文件中读入像素位到pBits指向的这块内存里。

2、可以将位图选入内存设备中，然后用GDI在上面绘图，其结果反映在由pBits指向的DIB像素位中，但因GDI采用批量处理，所以绘图结束后，要调用GDIFlush，以便真正的保存起来，也可以“手工”地访问像素位。

hSection

文件映射对象句柄

dwOffSet

像素位数据在上述对象中的偏移。MSDN指出，这个参数必须是4的倍数。

注意：创建出来的位图对象，是每行的字节数是4的倍数，也就是更像DIB。

 

（3）应用举例

 

  1. <span style="color: #008000;">　　 /*</span><span style="color: #008000;">创建384*256像素的DIB，每个像素为24位</span><span style="color: #008000;">*/</span><span style="color: #000000;">   
  2.      BITMAPINFOHEADER bmih;
  3.      BYTE</span>*<span style="color: #000000;">            pBits;
  4.      HBITMAP          hBitmap;
  5.  
  6.      bmih.biSize </span>= <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(BITMAPINFOHEADER);
  7.      bmih.biWidth </span>= <span style="color: #800080;">384</span><span style="color: #000000;">;
  8.      bmih.biHeight </span>= <span style="color: #800080;">256</span><span style="color: #000000;">;
  9.      bmih.biPlanes </span>= <span style="color: #800080;">1</span><span style="color: #000000;">;
  10.      bmih.biBitCount </span>= <span style="color: #800080;">24</span><span style="color: #000000;">;
  11.      bmih.biCompression </span>=<span style="color: #000000;"> BI_RGB;
  12.      bmih.biSizeImage </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  13.      bmih.biXPelsPerMeter </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  14.      bmih.biYPelsPerMeter </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  15.      bmih.biClrUsed </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  16.      bmih.biClrImportant </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;<br> 
  17.      </span><span style="color: #008000;">/*</span><span style="color: #008000;">
  18.       1、因24位，没颜色表，所以可以直接将bmih指针转为BITMAPINFO指针。
  19.       2、初始时pBits等于NULL，该函数会把pBits指针掰过来指向由系统维护的某内存块,我们的程序不必为pBits分配空间大小，在赋值是操作系统会自行分配，删除位图对象后该空间也会自行释放，程序不必自己释放。
  20.      </span><span style="color: #008000;">*/</span><span style="color: #000000;">
  21.      hBitmap </span>= CreateDIBSection(NULL, (BITMAPINFO*)&bmih, <span style="color: #800080;">0</span>, &pBits, NULL, <span style="color: #800080;">0</span><span style="color: #000000;">);
  22.     <br>     </span><span style="color: #008000;">//</span><span style="color: #008000;">从DIB文件中读入像素位到pBits中。</span><span style="color: #000000;">
  23.      ReadFile(hFile, </span>&pBits, ...);

（4）获取DIB区块信息——GetObject(hBitmap,sizeof(DIBSECTION),&dibsection);

DIBSECTION字段

含义

BITMAP dsBm

BITMAP结构

BITMAPINFOHEADER dsBmih

DIB信息头

DWORD    dsBitfields[3]

颜色遮罩

HANDLE   dshSection

文件映射对象句柄

DWORD    dsOffset

像素位数据的位移

注意：

1、该函数只能用在CreateDIBSection创建的位图对象，不能用在其他创建位图的函数返回的句柄上。

2、CreateDIBSection也可以通过GetObject(hBitmap,sizeof(BITMAP),&bm)返回位图信息。

3、该结构体不包括颜色表，如果用获得颜色表，可以将位图选入内存DC后，调用GetDIBColorTable来获得。

 

（5）DIB显示到屏幕——必须从设备无关的像素转换到设备相关的像素

函数

格式转换时机

SetDIBitsToDevice

StretchDIBits

发生在函数中

CreateDIBitmap

SetDIBits

1、未设置CBM_INIT时，发生在用 BitBlt或StretchBlt显示的时候或SetDIBits时

2、设置CBM_INIT时：发生在CreateDIBitmap函数中

CreateDIBSection创建区块

发生在用BitBlt或StretchBlt显示函数中。（注意：CreateDIBSection返回句柄实际上是DIB，但可以用BitBlt和StretchBlt函数显示），再次说明该返回值是个杂种，兼有DDB和DIB的特点。

（6）文件映射选项——CreateDIBSection的最后两个参数

①文件映射：把文件当作是己经存在于内存中，可以通过内存指针来访问，但并不需要把文件完全放到内存中。

②这项技术可减少内存需要。DIB像素位可保存在磁盘上，但却可以像内存一样的访问。但像素位必须保存在另外的文件中，不能是实际DIB文件的一部分。

　　hFile = CreateFile(szFileName,…);

　　…… //读入文件头（BITMAPFILEINFO）和信息头(BITMAPINFOHEADER)

　　hFileMap = CreateFileMapping(hFile,NULL,PAGE_READWRITE,0,0,NULL);

　　hBitmap = CreateDIBSection(NULL,pbmi,DIB_RGB_COLORS,&pBits,

　　hFileMap,bmfh.bfOffBits);//bfOffBits永远不会是4的倍数！

                                         //与MSDN要求不符，该代码不能用。


【DIBSecion程序】
效果图

技术分享

  1. <span style="color: #008000;">/*</span><span style="color: #008000;">------------------------------------------------------------
  2. DIBSECTION.C --Displays a DIB Section in the Client area
  3. (c) Charles Petzold, 1998
  4. ------------------------------------------------------------</span><span style="color: #008000;">*/</span><span style="color: #000000;">
  5. #include </span><windows.h><span style="color: #000000;">
  6. #include </span><span style="color: #800000;">"</span><span style="color: #800000;">resource.h</span><span style="color: #800000;">"</span><span style="color: #000000;">
  7. LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
  8. </span><span style="color: #0000ff;">static</span> TCHAR szAppName[] = TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">DibSection</span><span style="color: #800000;">"</span><span style="color: #000000;">);
  9. </span><span style="color: #0000ff;">int</span><span style="color: #000000;"> WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
  10.                    PSTR szCmdLine, </span><span style="color: #0000ff;">int</span><span style="color: #000000;"> iCmdShow)
  11. {
  12.     HWND         hwnd;
  13.     MSG          msg;
  14.     WNDCLASSEX     wndclass;
  15.     HACCEL       hAccel;
  16.     wndclass.style </span>= CS_HREDRAW |<span style="color: #000000;"> CS_VREDRAW;
  17.     wndclass.cbSize </span>= <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(WNDCLASSEX);
  18.     wndclass.lpfnWndProc </span>=<span style="color: #000000;"> WndProc;
  19.     wndclass.cbClsExtra </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  20.     wndclass.cbWndExtra </span>= <span style="color: #800080;">0</span><span style="color: #000000;">;
  21.     wndclass.hInstance </span>=<span style="color: #000000;"> hInstance;
  22.     wndclass.hIcon </span>=<span style="color: #000000;"> LoadIcon(hInstance, szAppName);
  23.     wndclass.hIconSm </span>=<span style="color: #000000;"> LoadIcon(hInstance, szAppName);
  24.     wndclass.hCursor </span>=<span style="color: #000000;"> LoadCursor(NULL, IDC_ARROW);
  25.     wndclass.hbrBackground </span>=<span style="color: #000000;"> (HBRUSH)GetStockObject(WHITE_BRUSH);
  26.     wndclass.lpszMenuName </span>=<span style="color: #000000;"> szAppName;
  27.     wndclass.lpszClassName </span>=<span style="color: #000000;"> szAppName;
  28.     </span><span style="color: #0000ff;">if</span> (!RegisterClassEx(&<span style="color: #000000;">wndclass))
  29.     {
  30.         MessageBox(NULL, TEXT(</span><span style="color: #800000;">"</span><span style="color: #800000;">This program requires Windows NT!</span><span style="color: #800000;">"</span><span style="color: #000000;">),
  31.                    szAppName, MB_ICONERROR);
  32.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  33.     }
  34.     hwnd </span>= CreateWindow(szAppName,                  <span style="color: #008000;">//</span><span style="color: #008000;"> window class name</span>
  35.                         TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">DIB Section Display</span><span style="color: #800000;">"</span>), <span style="color: #008000;">//</span><span style="color: #008000;"> window caption</span>
  36.                         WS_OVERLAPPEDWINDOW,        <span style="color: #008000;">//</span><span style="color: #008000;"> window style</span>
  37.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial x position</span>
  38.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial y position</span>
  39.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial x size</span>
  40.                         CW_USEDEFAULT,              <span style="color: #008000;">//</span><span style="color: #008000;"> initial y size</span>
  41.                         NULL,                       <span style="color: #008000;">//</span><span style="color: #008000;"> parent window handle</span>
  42.                         NULL,                       <span style="color: #008000;">//</span><span style="color: #008000;"> window menu handle</span>
  43.                         hInstance,                  <span style="color: #008000;">//</span><span style="color: #008000;"> program instance handle</span>
  44.                         NULL);                     <span style="color: #008000;">//</span><span style="color: #008000;"> creation parameters</span>
  45. <span style="color: #000000;">
  46.     ShowWindow(hwnd, iCmdShow);
  47.     UpdateWindow(hwnd);
  48.     hAccel </span>=<span style="color: #000000;"> LoadAccelerators(hInstance, szAppName);
  49.     </span><span style="color: #0000ff;">while</span> (GetMessage(&msg, NULL, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span><span style="color: #000000;">))
  50.     {
  51.         </span><span style="color: #0000ff;">if</span> (!TranslateAccelerator(hwnd, hAccel, &<span style="color: #000000;">msg))
  52.         {
  53.             TranslateMessage(</span>&<span style="color: #000000;">msg);
  54.             DispatchMessage(</span>&<span style="color: #000000;">msg);
  55.         }
  56.     }
  57.     </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> msg.wParam;
  58. }
  59. HBITMAP   CreateDibSectionFromDibFile(PTSTR szFileName)
  60. {
  61.     HBITMAP hBitmap;
  62.     BITMAPFILEHEADER  bmfh;
  63.     BITMAPINFO</span>*<span style="color: #000000;">       pbmi;
  64.     BYTE</span>*<span style="color: #000000;">             pBits;
  65.     BOOL    bSuccess;
  66.     HANDLE  hFile;
  67.     DWORD   dwInfoSize, dwBytesRead;
  68.     </span><span style="color: #008000;">//</span><span style="color: #008000;">打开位图，可读可写</span>
  69.     hFile =<span style="color: #000000;"> CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
  70.                        OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
  71.     </span><span style="color: #0000ff;">if</span> (hFile ==<span style="color: #000000;"> INVALID_HANDLE_VALUE)
  72.         </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> NULL;
  73.     </span><span style="color: #008000;">//</span><span style="color: #008000;">与前一个程序（DIBConv）不同，这里不读入整个文件，而是只读取文件头</span>
  74.     bSuccess = ReadFile(hFile, &bmfh, <span style="color: #0000ff;">sizeof</span>(BITMAPFILEHEADER), &<span style="color: #000000;">dwBytesRead, NULL);
  75.     </span><span style="color: #0000ff;">if</span> (!bSuccess || (dwBytesRead != <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(BITMAPFILEHEADER))
  76.         </span>|| (bmfh.bfType != *(WORD*)<span style="color: #800000;">"</span><span style="color: #800000;">BM</span><span style="color: #800000;">"</span><span style="color: #000000;">))
  77.     {
  78.         CloseHandle(hFile);
  79.         </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> NULL;
  80.     }
  81.     </span><span style="color: #008000;">//</span><span style="color: #008000;">为BITMAPINFO分配内存，并读入数据</span>
  82.     dwInfoSize = bmfh.bfOffBits - <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(BITMAPFILEHEADER);
  83.     pbmi </span>= <span style="color: #0000ff;">malloc</span><span style="color: #000000;">(dwInfoSize);
  84.     bSuccess </span>= ReadFile(hFile, pbmi, dwInfoSize, &<span style="color: #000000;">dwBytesRead, NULL);
  85.     </span><span style="color: #008000;">//</span><span style="color: #008000;">创建DDB——函数调用后，pBits指针会被掰向，一个存放像素数的内存，该内存由系统维护。</span>
  86.     hBitmap = CreateDIBSection(NULL, pbmi, DIB_RGB_COLORS, &pBits, NULL, <span style="color: #800080;">0</span><span style="color: #000000;">);
  87.     </span><span style="color: #008000;">//</span><span style="color: #008000;">为像素位内存写入像素数据</span>
  88.     ReadFile(hFile, pBits, bmfh.bfSize - bmfh.bfOffBits, &<span style="color: #000000;">dwBytesRead, NULL);
  89.     </span><span style="color: #0000ff;">free</span><span style="color: #000000;">(pbmi);
  90.     CloseHandle(hFile);
  91.     </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> hBitmap;
  92. }
  93. LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
  94. {
  95.     </span><span style="color: #0000ff;">static</span> TCHAR szFilter[] = TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">Bitmap File(*.bmp)\0*.bmp\0</span><span style="color: #800000;">"</span><span style="color: #000000;">)
  96.         TEXT(</span><span style="color: #800000;">"</span><span style="color: #800000;">All Files(*.*)\0*.*\0\0</span><span style="color: #800000;">"</span><span style="color: #000000;">);
  97.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> TCHAR szFileName[MAX_PATH], szTitleName[MAX_PATH];
  98.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> cxClient, cyClient;
  99.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> HBITMAP hBitmap;
  100.     HDC         hdc, hdcMem;
  101.     PAINTSTRUCT ps;
  102.     BITMAP  bitmap;
  103.     </span><span style="color: #0000ff;">static</span><span style="color: #000000;"> OPENFILENAME  ofn;
  104.     </span><span style="color: #0000ff;">switch</span><span style="color: #000000;"> (message)
  105.     {
  106.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_CREATE:
  107.         memset(</span>&ofn, <span style="color: #800080;">0</span>, <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(OPENFILENAME));
  108.         ofn.lStructSize </span>= <span style="color: #0000ff;">sizeof</span><span style="color: #000000;">(OPENFILENAME);
  109.         ofn.hwndOwner </span>=<span style="color: #000000;"> hwnd;
  110.         ofn.lpstrFilter </span>=<span style="color: #000000;"> szFilter;
  111.         ofn.lpstrFile </span>=<span style="color: #000000;"> szFileName;
  112.         ofn.nMaxFile </span>=<span style="color: #000000;"> MAX_PATH;
  113.         ofn.lpstrTitle </span>=<span style="color: #000000;"> szTitleName;
  114.         ofn.nMaxFileTitle </span>=<span style="color: #000000;"> MAX_PATH;
  115.         ofn.lpstrDefExt </span>= TEXT(<span style="color: #800000;">"</span><span style="color: #800000;">*.bmp</span><span style="color: #800000;">"</span><span style="color: #000000;">);
  116.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  117.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_SIZE:
  118.         cxClient </span>=<span style="color: #000000;"> LOWORD(lParam);
  119.         cyClient </span>=<span style="color: #000000;"> HIWORD(lParam);
  120.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  121.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_COMMAND:
  122.         </span><span style="color: #0000ff;">switch</span><span style="color: #000000;"> (LOWORD(wParam))
  123.         {
  124.         </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> IDM_FILE_OPEN:
  125.             </span><span style="color: #008000;">//</span><span style="color: #008000;">显示打开对话框</span>
  126.             <span style="color: #0000ff;">if</span> (!GetOpenFileName(&<span style="color: #000000;">ofn))
  127.                 </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  128.             </span><span style="color: #008000;">//</span><span style="color: #008000;">删除己经打开的位图</span>
  129.             <span style="color: #0000ff;">if</span><span style="color: #000000;"> (hBitmap)
  130.             {
  131.                 DeleteObject(hBitmap);
  132.                 hBitmap </span>=<span style="color: #000000;"> NULL;
  133.             }
  134.             SetCursor(LoadCursor(NULL, IDC_WAIT));
  135.             ShowCursor(TRUE);
  136.             </span><span style="color: #008000;">//</span><span style="color: #008000;">从DIB位图文件中创建DDB(或DIB区块)</span>
  137.             hdc =<span style="color: #000000;"> GetDC(hwnd);
  138.             hBitmap </span>=<span style="color: #000000;"> CreateDibSectionFromDibFile(szFileName);
  139.             ReleaseDC(hwnd, hdc);
  140.             ShowCursor(FALSE);
  141.             SetCursor(LoadCursor(NULL, IDC_ARROW));
  142.             </span><span style="color: #008000;">//</span><span style="color: #008000;">更新客户区内容</span>
  143. <span style="color: #000000;">            InvalidateRect(hwnd, NULL, TRUE);
  144.             </span><span style="color: #008000;">//</span><span style="color: #008000;">错误提示</span>
  145.             <span style="color: #0000ff;">if</span> (hBitmap ==<span style="color: #000000;"> NULL)
  146.             {
  147.                 MessageBox(hwnd, TEXT(</span><span style="color: #800000;">"</span><span style="color: #800000;">Cannot load DIB file</span><span style="color: #800000;">"</span>), szAppName, MB_OK |<span style="color: #000000;"> MB_ICONEXCLAMATION);
  148.             }
  149.             </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  150.         }
  151.         </span><span style="color: #0000ff;">break</span><span style="color: #000000;">;
  152.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_PAINT:
  153.         hdc </span>= BeginPaint(hwnd, &<span style="color: #000000;">ps);
  154.         </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> (hBitmap)
  155.         {
  156.             GetObject(hBitmap, </span><span style="color: #0000ff;">sizeof</span>(BITMAP), &<span style="color: #000000;">bitmap);
  157.             hdcMem </span>=<span style="color: #000000;"> CreateCompatibleDC(hdc);
  158.             SelectObject(hdcMem, hBitmap);
  159.             BitBlt(hdc, </span><span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, bitmap.bmWidth, bitmap.bmHeight, hdcMem, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span><span style="color: #000000;">, SRCCOPY);
  160.             DeleteDC(hdcMem);
  161.         }
  162.         EndPaint(hwnd, </span>&<span style="color: #000000;">ps);
  163.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  164.     </span><span style="color: #0000ff;">case</span><span style="color: #000000;"> WM_DESTROY:
  165.         </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> (hBitmap)
  166.             DeleteObject(hBitmap);
  167.         PostQuitMessage(</span><span style="color: #800080;">0</span><span style="color: #000000;">);
  168.         </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">;
  169.     }
  170.     </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> DefWindowProc(hwnd, message, wParam, lParam);
  171. }</span>

//resource.h

  1. <span style="color: #008000;">//</span><span style="color: #008000;">{{NO_DEPENDENCIES}}
  2. </span><span style="color: #008000;">//</span><span style="color: #008000;"> Microsoft Visual C++ 生成的包含文件。
  3. </span><span style="color: #008000;">//</span><span style="color: #008000;"> 供 DIBSection.rc 使用
  4. </span><span style="color: #008000;">//
  5. </span><span style="color: #0000ff;">#define</span> IDM_FILE_OPEN                   40001
  6. <span style="color: #008000;">//</span><span style="color: #008000;"> Next default values for new objects
  7. </span><span style="color: #008000;">//</span> 
  8. <span style="color: #000000;">#ifdef APSTUDIO_INVOKED
  9. #ifndef APSTUDIO_READONLY_SYMBOLS
  10. </span><span style="color: #0000ff;">#define</span> _APS_NEXT_RESOURCE_VALUE        103
  11. <span style="color: #0000ff;">#define</span> _APS_NEXT_COMMAND_VALUE         40004
  12. <span style="color: #0000ff;">#define</span> _APS_NEXT_CONTROL_VALUE         1001
  13. <span style="color: #0000ff;">#define</span> _APS_NEXT_SYMED_VALUE           101
  14. <span style="color: #0000ff;">#endif</span>
  15. <span style="color: #0000ff;">#endif</span>

//DibSection.rc

  1. <span style="color: #008000;">//</span><span style="color: #008000;"> Microsoft Visual C++ generated resource script.
  2. </span><span style="color: #008000;">//
  3. </span>#include <span style="color: #800000;">"</span><span style="color: #800000;">resource.h</span><span style="color: #800000;">"</span>
  4. <span style="color: #0000ff;">#define</span> APSTUDIO_READONLY_SYMBOLS
  5. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  6. <span style="color: #008000;">//</span>
  7. <span style="color: #008000;">//</span><span style="color: #008000;"> Generated from the TEXTINCLUDE 2 resource.
  8. </span><span style="color: #008000;">//
  9. </span>#include <span style="color: #800000;">"</span><span style="color: #800000;">winres.h</span><span style="color: #800000;">"</span>
  10. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  11. <span style="color: #0000ff;">#undef</span> APSTUDIO_READONLY_SYMBOLS
  12. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  13. <span style="color: #008000;">//</span><span style="color: #008000;"> 中文(简体，中国) resources</span>
  14. <span style="color: #0000ff;">#if</span> !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)<span style="color: #000000;">
  15. LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED
  16. #ifdef APSTUDIO_INVOKED
  17. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  18. <span style="color: #008000;">//</span>
  19. <span style="color: #008000;">//</span><span style="color: #008000;"> TEXTINCLUDE
  20. </span><span style="color: #008000;">//
  21. </span><span style="color: #800080;">1</span><span style="color: #000000;"> TEXTINCLUDE
  22. BEGIN
  23. </span><span style="color: #800000;">"</span><span style="color: #800000;">resource.h\0</span><span style="color: #800000;">"</span><span style="color: #000000;">
  24. END
  25. </span><span style="color: #800080;">2</span><span style="color: #000000;"> TEXTINCLUDE
  26. BEGIN
  27. </span><span style="color: #800000;">"</span><span style="color: #800000;">#include </span><span style="color: #800000;">""</span><span style="color: #800000;">winres.h</span><span style="color: #800000;">""</span><span style="color: #800000;">\r\n</span><span style="color: #800000;">"</span>
  28. <span style="color: #800000;">"</span><span style="color: #800000;">\0</span><span style="color: #800000;">"</span><span style="color: #000000;">
  29. END
  30. </span><span style="color: #800080;">3</span><span style="color: #000000;"> TEXTINCLUDE
  31. BEGIN
  32. </span><span style="color: #800000;">"</span><span style="color: #800000;">\r\n</span><span style="color: #800000;">"</span>
  33. <span style="color: #800000;">"</span><span style="color: #800000;">\0</span><span style="color: #800000;">"</span><span style="color: #000000;">
  34. END
  35. </span><span style="color: #0000ff;">#endif</span>    <span style="color: #008000;">//</span><span style="color: #008000;"> APSTUDIO_INVOKED</span>
  36. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  37. <span style="color: #008000;">//</span>
  38. <span style="color: #008000;">//</span><span style="color: #008000;"> Menu
  39. </span><span style="color: #008000;">//
  40. </span><span style="color: #000000;">DIBSECTION MENU
  41. BEGIN
  42. POPUP </span><span style="color: #800000;">"</span><span style="color: #800000;">&File</span><span style="color: #800000;">"</span><span style="color: #000000;">
  43. BEGIN
  44. MENUITEM </span><span style="color: #800000;">"</span><span style="color: #800000;">&Open...\tCtrl+O</span><span style="color: #800000;">"</span><span style="color: #000000;">, IDM_FILE_OPEN
  45. END
  46. END
  47. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  48. <span style="color: #008000;">//</span>
  49. <span style="color: #008000;">//</span><span style="color: #008000;"> Accelerator
  50. </span><span style="color: #008000;">//
  51. </span><span style="color: #000000;">DIBSECTION ACCELERATORS
  52. BEGIN
  53. </span><span style="color: #800000;">"</span><span style="color: #800000;">^O</span><span style="color: #800000;">"</span><span style="color: #000000;">, IDM_FILE_OPEN, ASCII, NOINVERT
  54. END
  55. </span><span style="color: #0000ff;">#endif</span>    <span style="color: #008000;">//</span><span style="color: #008000;"> 中文(简体，中国) resources</span>
  56. <span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  57. <span style="color: #000000;">#ifndef APSTUDIO_INVOKED
  58. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  59. <span style="color: #008000;">//</span>
  60. <span style="color: #008000;">//</span><span style="color: #008000;"> Generated from the TEXTINCLUDE 3 resource.
  61. </span><span style="color: #008000;">//
  62. </span><span style="color: #808080;">///////////////////////////////////////////////////////////////////////////</span><span style="color: #008000;">//</span>
  63. <span style="color: #0000ff;">#endif</span>    <span style="color: #008000;">//</span><span style="color: #008000;"> not APSTUDIO_INVOKED</span>

 

第15章 设备相关位图_15.3 DIB和DDB的结合

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